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Crusty “growth” on concrete basement floor

1496 Views 4 Replies 3 Participants Last post by  Bud9051
This crusty spot on my basement concrete floor keeps returning after I scrape it off.

I'm wondering what's causing it, and the best way to permanently patch it. It's under my washer/dryer, in an area that usually remains dry.

Photos are before and after scraping it off.

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Thanks Bud, The hose you see is just the overflow for a softener, so it’s never carried any water.

But the main sewer line is under this area and until a couple of years ago had a crack (discovered during a video inspection) which was repaired back then. No sump pit, but I suspect there’s some moisture below the slab on this side of the basement, but not a lot. It takes months for that crust to build up.
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